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3 years ago

How many valence electrons does the neutral Mg atom have?

2 answers:

8 0

Magnesium is element 12 and belongs to Group 2 of the Periodic Table. An element in Group 2 has two valence electrons. Also, the electron configuration of Mg is 1s² 2s²2p⁶ 3s² or [Ne]3s². Since the 3s² electrons are the outermost electrons, magnesium has two valence electrons.23 dic. 2014

Zanzabum3 years ago

7 0

Answer:

2 valence electrons

Explanation:

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Calculate the concentration of the following solution in mol/dm3 0.1 moles of NaCl in 200 cm3

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1 $cm ^{3}$ = 0.001 $dm ^{3}$ . Therefore 200 $cm ^{3}$ = 0.2 $dm ^{3}$ . Molarity = $\frac{number of moles of NaCl}{volume of the solution} = \frac{0.1}{0.2} = 0.5 mol/dm^{3}$ . Hope this helps.

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3 years ago

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The surface area is 109.3 square centimeters or 0.01093 square meters. The area formula requires that we use the radius of the disc. We can find the radius by diving the diameter by 2, so radius = 11.8/2 or 5.9 cm. We can use 3.14 as an approximation for Ď€. The surface area is 3.14 * (5.9*5.9). Since the diameter is given in cm, the surface area units are in square centimeters. To convert to meters, divide any measurement in centimeters by 100, but we need to convert to "square" meters, so we need to divide our square centimeters by 100 * 100, or by 10,000. Dividing 109.3 by 10,000 results in 0.01093 square "meters".

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3 years ago

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2 years ago

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During the preparation and usage of flammable gases, safety precautions should be properly enforced such as the wearing of appropriate safety gear and goggles.

Devices that mix air or oxygen with flammable gases cannot be used unless approved by an authorized or approved personnel.

To learn more, visit the link below:

brainly.com/question/3702349

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